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CDV-700 calibration question.

Posted: Mon Jul 14, 2014 5:58 pm
Hello all, unsure if this is a good place to discuss this or not, but I can't find many Geiger counter forums.

I recently got myself a CDV 700, and while I want to get it professionally calibrated it's a bit expensive at this time (a tad over $100, just $35 less than I paid not including shipping).

Anyways, I have heard that the test source is either supposed to measure at 2 exactly, or between two and 3, however this one reads up to 4 easily, and can even max out the meter (all on the 10x range btw) if I position it right.

Now, if anything it should read lower due to the half life of depleted uranium, no?

Just wondering if I should "calibrate" it so that it reads roughly 2 or so, or if it might be fine, and they used the alternative to depleted uranium and somehow it has gained radioactivity?

Anyways, just hoping for it to be roughly accurate till I have the spare cash to get it calibrated. It is understandable that it is out of cal though, since the last calibration was in 1984 :)

CDV 700 calibration question

Posted: Thu Jul 21, 2016 4:26 pm
by JoshuaOa
Oh, forgot to mention by following the above noted instructions the midrange best number for calibration was 10 this time first photo - for the above pictures. The first time I did it the midrange best number was -8